Biology B Unit 3

What phase of mitosis is represented in the diagram?

• prophase

• metaphase

• anaphase

• The cell is in prophase of mitosis because the number of chromosomes has doubled.

• The cell is in prophase of meiosis because the number of chromosomes has doubled.

• The cell is in telophase of mitosis because there are two copies of each chromosome.

What happens during the S phase of the cell cycle?

• cell size doubles

• DNA replicates

• chromosomes form

G1 phase, S phase and G2 phase are all parts of which phase?

• Interphase

• Prophase

• Anaphase

A single nucleotide of DNA is composed of which of the following substances?

• adenine, thymine, guanine

• hydrogen, a phosphate group and adenine

• deoxyribose sugar, a phosphate group and a nitrogen base

The diagram below shows a strand of DNA matched to a strand of messenger RNA. What process does this represent?

• mutation

• respiration

• transcription

Which of the choices is the messenger RNA code for this given segment of DNA? TGC - GGA - CTC - CTC

• AGC - CCT - GAA - GAA

• TCC - GGT - CTC - CTC

• ACG - CCU - GAG - GAG

In eukaryotic cells, the process indicated by letter A occurs in the

• cytoplasm

• ribosome

• nucleus

What happens during the process of translation?

• Messenger RNA is made from DNA.

• The cell uses information from messenger RNA to produce proteins.

• Transfer RNA is made from messenger RNA.

Which nitrogenous base pairs with guanine?

• Adenine

• Cytosine

• Thymine